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subTask 2.3 Development of location aware services for WLAN users
Leader: Óscar Cánovas; Researchers: Félix J. García 

1. Brief Description of the Goals

Location-based services are a special kind of application which takes into account information about the geographical location of a particular subject in order to provide a context-dependent service. The main purpose of this subTask is to define an architecture for indoor location services based on widely deployed technologies such as 802.11 or Bluetooth. Using some models for signal propagation and received signal strength (RSSI), the architecture will be able to determine, in real time, the location of a particular subject.

2. Scientific and Technical Developed Activities

We have developed a first prototype based on 802.11 and fingerprints. The system has been deployed in two different phases. On one hand, we analyzed the indoor environment, a building floor, to determine the number of fingerprints to be obtained and to record the signals from the existing access points. On the other hand, a second online phase has been accomplished to test some initial location algorithms based on RSSI. This prototype makes use of specific software that has been installed in laptops and smartphones to provide the signal information to a central server which is responsible for the location estimation. Current accuracy is around 0.85 meters.

Publications: [Sanchez08]

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